Basic optimization
The XL compiler supports several levels of optimization, with each option level building on the levels below through increasingly aggressive transformations and consequently using more machine resources.
Ensure that your application compiles and executes properly at
low optimization levels before you try more aggressive optimizations.
This topic discusses two optimizations levels, listed with complementary
options in Table 1.
The table also includes a column for compiler options that can have
a performance benefit at that optimization level for some applications.
